JP6781094B2 - Differential - Google Patents

Description

The present invention relates to a differential device mounted on a vehicle such as a four-wheeled vehicle.

Conventionally, in a differential device, a technique of holding and supporting a pinion shaft with a support member has been known (for example, Patent Documents 1 to 4). Further, the structure of a flat differential device is already known (for example, Patent Document 5).

China Utility Model No. 202441834 JP-A-7-279632 JP-A-7-279631 U.S. Pat. No. 7,470,207 Patent No. 5742778

However, Patent Documents 2 to 4 do not mention the improvement of the lubrication performance of the pinion gear by taking in the lubricating oil from the outside of the differential device. Further, in Patent Document 1, although it is possible to take in the lubricating oil outside the differential device from the cover side covering the side gear, it is difficult to take in the lubricating oil outside the differential device from the radial outside of the support member. Met.

The present invention has been made in view of the above circumstances, and can improve the lubrication performance of a pinion gear (differential gear) by taking in lubricating oil outside the differential device from the support member side into the differential device. It is an object of the present invention to provide a differential device capable of providing a differential device.

In order to achieve the above object, the differential device according to one embodiment of the present invention includes a plurality of differential gears, a plurality of differential gear support members for supporting each of the plurality of differential gears, and the plurality of differential gears. It has a pair of output gears that mesh with each of the differential gears, and a plurality of support portions at both ends that support both ends of each of the differential gear support members, and a space is provided in the central portion radially inward from the support portions at both ends. Is formed, a first cover member arranged on the back side of one of the output gears and capable of being coupled to the support member, and a support member arranged on the back side of the other output gear and coupled with the support member. It comprises a second cover member capable, and the between the both end support portions two adjacent support members, penetrating to the said toward the radially outer side of the support member radially inward space recess There are formed, each of said plurality of both end support portions, the front SL has an end-side supporting portion in supporting the inner end of the differential gear support member, on the inner end side supporting portion, the A through hole is formed that penetrates the inner end side support portion.

Preferably, the support member has a plurality of wall portions each including both end support portions, and at least one of the wall portions is formed with an opening penetrating the outside and the inside of the wall portion. ..

Preferably, the support member has a recess formed from the outer side in the radial direction to the inner side in the radial direction on the surface forming one side surface or the bottom surface of the recess.

In order to achieve the above object, the differential device according to another aspect of the present invention includes a plurality of differential gears, a plurality of differential gear support members that support each of the plurality of differential gears, and a plurality of differential gear support members. A pair of output gears that mesh with the plurality of differential gears, a plurality of support portions at both ends that support both ends of each of the differential gear support members, and a plurality of support portions at both ends that are adjacent to each other. A support member having a connecting portion and a space formed in the central portion, a first cover member arranged on the back surface side of one of the output gears and capable of being coupled to the support member, and the other output gear. A second cover member that is arranged on the back side of the support member and can be coupled to the support member is provided, and between the two adjacent both end support portions of the support member, the support member is radially inward. The connecting portion is formed with a recess on the radial outer side of the support member, and the connecting portion is provided between the first cover member and the second cover member in the radial direction of the support member. A radial space extending toward is formed, and each of the plurality of both end support portions has at least one support portion that supports one end portion of the differential gear support member, and the one support portion. Is formed with a through hole that penetrates the one support portion.

In order to achieve the above object, the differential device according to another aspect of the present invention includes a plurality of differential gears, a plurality of differential gear support members that support each of the plurality of differential gears, and a plurality of differential gear support members. A pair of output gears that mesh with the plurality of differential gears, a support member having a plurality of wall portions having support portions at both ends that support both ends of the differential gear support members, and one output gear. A first cover member arranged on the back side of the gear and capable of being coupled to the support member, and a second cover member arranged on the back side of the other output gear and capable of being coupled to the support member are provided adjacent to each other. Each of the two wall portions is connected by a plurality of connecting portions or directly, and between the two adjacent wall portions, the support member is radially outward to radially inward. A recess is formed so as to be recessed toward, and the both end support portions of each of the wall portions include an inner end side support portion that supports the inner end portion of the differential gear support member and the differential gear support member. The outer end side support portion is provided, and at least one of the wall portions has the recess, the inner end side support portion, and the outer side on the radial outer side of the inner end side support portion. An opening that penetrates the space between the end-side support portions is formed, and the inner-end-side support portion is radially outward of the differential gear from the outer diameter of the radial inner end of the differential gear. Overhanging .

In order to achieve the above object, the differential device according to another aspect of the present invention includes a plurality of differential gears, a plurality of differential gear support members for supporting each of the plurality of differential gears, and a plurality of differential gear support members. A plurality of output gears each meshing with the plurality of differential gears, both end support portions for supporting both end portions of the differential gear support members, and side wall portions for connecting both end support portions. A support member having a wall portion and a plurality of connecting portions connecting the two adjacent wall portions, and a first cover member arranged on the back side of one of the output gears and capable of being coupled to the support member. A second cover member, which is arranged on the back side of the other output gear and can be coupled to the support member, is provided, and the diameter of the support member is provided between two adjacent wall portions of the support member. The connecting portion is formed on the inner side in the direction, and the concave portion is formed on the outer side in the radial direction of the support member, and the side wall portion is formed between each of the first cover member and the second cover member. A circumferential space extending in the circumferential direction of the support member is formed.

According to the present invention, the lubricating performance of the differential gear can be improved by taking in the lubricating oil outside the differential device from the support member side into the differential device.

It is a vertical cross-sectional view which shows typically the whole structure of the differential device which concerns on 1st Embodiment of this invention. It is an enlarged perspective view of a differential device. It is an exploded perspective view of the differential device. It is a front view which shows typically the support member which concerns on 2nd Embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 schematically shows the overall configuration of the differential device 11 according to the first embodiment of the present invention. The automobile includes, for example, a transmission case 12 which is arranged next to an engine (not shown) as a power source mounted on the automobile and houses a transmission (not shown) and a differential device 11. In the transmission case 12, for example, a pair of left and right output shafts 13a and 13b connected to the axles are rotatably supported around the central axis CL. The two output shafts 13a and 13b are arranged coaxially with each other and each have one end coupled to the differential device 11 in the mission case 12.

The differential device 11 includes, for example, a differential case 14 rotatably supported by the transmission case 12 around the central axis CL, a first side gear 25 that rotates around the central axis CL, and a central axis that faces the first side gear 25. A second side gear 26 that rotates relative to the first side gear 25 around the CL, and a plurality of pinion gears 27 that are arranged between the first side gear 25 and the second side gear 26 and each mesh with a pair of side gears 25 and 26. , A pinion shaft 28 that supports each pinion gear 27.

Further, in supporting the differential case 14, a bearing 15 is arranged on the differential case 14. Further, for example, the output member 17 of the reduction gear mechanism 16 is coupled to the differential case (input member) 14. Further, the power of the engine is transmitted from the transmission to the reduction gear mechanism 16. Further, the reduction gear mechanism 16 is configured as, for example, a planetary gear mechanism. That is, the reduction gear mechanism 16 has, for example, a carrier 21, a sun gear 18 having outward gear teeth on the outer periphery around the central axis CL, and rotating around the central axis CL in conjunction with the output shaft of the transmission, and a sun gear. A ring gear 19 concentrically surrounding the sun gear 18 and fixed to the inner wall of the transmission case 12 and having inward gear teeth facing the gear teeth of the sun gear 18 and a ring gear 19 arranged between the sun gear 18 and the ring gear 19 of the sun gear 18. A planetary gear 22 that meshes with the gear teeth and the gear teeth of the ring gear 19 and is rotatably supported by the carrier 21 around a rotation axis RT that is parallel to the central axis CL and located at an equal distance from the central axis CL. ..

Further, the carrier 21 is coupled to the differential case 14 so as not to rotate relative to the central axis CL. In other words, the carrier 21 rotates together with the differential case 14. Further, the carrier 21 functions as an output member 17 of the reduction gear mechanism 16. Further, the differential case 14 functions as an input member of the differential device 11. The reduction gear mechanism 16 may be composed of a plurality of spur gear trains instead of the planetary gear mechanism.

Further, for example, an annular seal member 24 is arranged between the mission case 12 and the individual output shafts 13a and 13b. In FIG. 1, only one of the seal members 24 is shown. The seal member 24 tightly closes between the transmission case 12 and the rotating output shafts 13a and 13b. In the present embodiment, an oil pan (not shown) is formed at the bottom of the mission case 12 so as to face the internal space of the mission case 12 and store a predetermined amount of lubricating oil. The stored lubricating oil is scraped up and scattered in the internal space of the transmission case 12 by the moving elements of the reduction gear mechanism 16 and the rotation of the differential case 14. In this way, the mechanically moving parts existing inside and outside the differential case 14 are lubricated by the scattered lubricating oil.

The first side gear (side gear, first output gear, output gear) 25 is, for example, a cylindrical first shaft portion 25a spline-coupled to the inner end portion of the output shaft 13a, and side gears 25, 26 from the first shaft portion 25a. In the axial direction of the annular first tooth portion 25c having the first gear teeth 25b meshing with the plurality of pinion gears 27 and the side gears 25 and 26 of the first shaft portion 25a at positions separated outward in the radial direction of the above. The first intermediate wall portion 25d extending radially outwardly from the side gears 25 and 26 toward the inner peripheral end portion of the side gears 25 and 26 of the first tooth portion 25c in the radial direction is provided. Therefore, the relative rotation around the central axis CL is prevented between the output shaft 13a and the first side gear 25. Further, the first intermediate wall portion 25d integrally connects the first shaft portion 25a and the inner peripheral end portion of the first tooth portion 25c.

Further, the second side gear (side gear, second output gear, output gear) 26 is, for example, a cylindrical shape that faces the first shaft portion 25a and is spline-coupled to the inner end portion of the output shaft 13b facing the output shaft 13a. A second gear tooth that faces the second shaft portion 26a and the first tooth portion 25c and is located at a position distant from the second shaft portion 26a in the radial direction of the side gears 25 and 26 and meshes with a plurality of pinion gears 27. From the annular second tooth portion 26c having 26b and the inner end portion of the side gears 25 and 26 of the second shaft portion 26a in the axial direction to the inner peripheral end portion of the side gears 25 and 26 of the second tooth portion 26c in the radial direction. A second intermediate wall portion 26d extending outward in the radial direction of the side gears 25 and 26 is provided. Therefore, relative rotation around the central axis CL is prevented between the output shaft 13b and the second side gear 26. Further, the second intermediate wall portion 26d integrally connects the second shaft portion 26a and the inner peripheral end portion of the second tooth portion 26c.

Further, the plurality of pinion gears (differential gears) 27 are rotatably arranged around the rotation axis RL extending radially from the central axis CL. Further, each pinion gear 27 is formed with a gear tooth 27a that meshes with the first gear tooth 25b and the second gear tooth 26b. Further, the plurality of pinion gears 27 are housed in the differential case 14 and can rotate with respect to the differential case 14, and can revolve around the central axis CL as the differential case 14 rotates.

Further, the individual pinion shafts (shafts, differential gear support members) 28 are arranged coaxially with the rotation axis RL extending radially from the central axis CL. Further, the individual pinion shafts 28 project radially inward and outward in the side gears 25 and 26 of the pinion gear 27, for example, on the rotation axis RL. Further, each pinion shaft 28 is formed with a through hole into which a pin 36, which will be described later, can be inserted. Instead of the pinion shaft 28 for each pinion gear 27, for example, one pinion that intersects the central axis CL in common with two (plurality) pinion gears arranged at a central angle of 180 degrees around the central axis CL. A shaft may be used.

Further, the differential case 14 has, for example, a support member 31, a first cover member 32, and a second cover member 33.

The first cover member 32 is arranged behind the first side gear 25 and can be connected (connectable) to one side surface of the support member 31, and is connected to the side opposite to the surface facing the support member 31. It has a cylindrical boss portion in the center of the surface. Further, the second cover member 33 faces, for example, the first cover member 32, is arranged behind the second side gear 26, and can be connected (connectable) to the other side surface of the support member 31. Further, the second cover member 33 has, for example, a cylindrical boss portion at the center of a surface opposite to the surface facing the support member 31. Then, the bearing 15 is attached to the boss portion of the second cover member 33. Further, the support member 31 is arranged, for example, between the first cover member 32 and the second cover member 33. Further, the support member 31 is, for example, an annular member, and the central portion is a cavity 46. That is, the support member 31 has a cavity (space) 46 formed in the central portion.

Further, the support member 31 connects, for example, a plurality of surrounding walls 34 that individually surround one pinion gear 27 that is rotatable around the central axis CL radially and two adjacent surrounding walls 34 ( It has a plurality of connecting plates (connecting portions) 43 (to be connected). In the present embodiment, as shown in FIG. 3, four surrounding walls 34 are formed radially on the central axis CL. Further, the surrounding walls 34 are arranged at equal intervals in the circumferential direction of the central axis CL, for example.

Further, each surrounding wall (wall portion) 34 is, for example, a plurality of both end support portions 35 that individually support both end portions (one end portion and the other end portion) of the pinion shaft 28, and a plurality of both end support portions 35. It has a side surface portion 50 and. Further, the inner wall of each surrounding wall 34, that is, the inner end side support portion (one support portion, the other support portion) 35a of both end support portions 35 has a shaft hole 48 penetrating the inner end side support portion 35a. It is formed. That is, the shaft hole (through hole) 48 of each inner end side support portion 35a opens to the cavity 46 in the central portion of the support member 31 (opens at the inner end surface of the inner end side support portion 35a). Further, the outer wall of each surrounding wall 34, that is, the outer end side support portion (the other support portion, one support portion) 35b of both end support portions 35 has a shaft hole 42 penetrating the outer end side support portion 35b. It is formed. That is, the shaft hole 42 of each outer end side support portion 35b is opened on the outer peripheral surface of the outer end side support portion 35b.

Further, the inner end portion (one end portion) of each pinion shaft 28 is inserted into the shaft hole 48 of each inner end side support portion 35a. Further, the outer end portion (the other end portion) of the pinion shaft 28 is inserted into the shaft hole 42 of each outer end side support portion 35b. Further, the outer peripheral surface of each outer end side support portion 35b forms the outer peripheral surface of the support member 31. Further, each outer end side support portion 35b is formed with a hole having an axial center parallel to the central axis CL and into which a pin 36 for preventing slipping can be inserted. Therefore, by inserting the pin 36 into each of the outer end side support portion 35b and the pinion shaft 28, the pinion shaft 28 is supported by the support member 31 without falling off from the support member 31.

Further, between the two adjacent both end support portions 35, for example, a recess 41 recessed from the outer peripheral side to the inner peripheral side of the support member 31 is formed. The recess 41 partitions a space between the first cover member 32 and the second cover member 33 that exposes at least one of the first side gear 25 and the second side gear 26. Further, the concave portion (recessed hole) 41 is connected to, for example, the cavity 46. That is, the recess 41 opens inward in the radial direction of the support member 31. That is, the recess 41 penetrates the support member 31 radially outward and radially inward. Therefore, the differential device 11 can send the lubricating oil dropped from the mission case 12 to the center side of the differential device 11 from the radial outside of the support member 31 via the recess 41.

Further, a plurality of connecting plates 43, by each of the plurality of connecting plate 43 is connected to the two circumference seen wall 34 adjacent (connected) connecting the plurality of surrounding walls 34. Further, the outer peripheral surface of the connecting plate 43 in the radial direction of the support member 31 forms the outer peripheral surface of the support member 31. Further, in the connecting plate 43, for example, a recess 45 is formed in a part of the outer peripheral surface of the support member 31 in the radial direction. Further, the recessed portion 45 is recessed from the outer peripheral surface of the support member 31 of the connecting plate 43 in the radial direction toward the inner peripheral surface of the support member 31 in the radial direction (from the radial outer side to the inner side of the support member 31). I'm sorry. Further, in the present embodiment, the recessed portion 45 (more specifically, the surface of the recessed portion 45) is formed by a curved surface having a bus line parallel to the central axis CL.

Further, for example, a part of one side surface portion 50a (50) of the surrounding wall 34 which is the side surface of the recess 41, one end portion 35aa in the circumferential direction of the inner end support portion 35a of both end support portions 35, and the side surface of the recess 41. other side surface portion 50b (50) of the part and the both end opening through the outer and the inner inner end support portion 35a of the circumferential direction end portion surrounding wall 34 on 35ab of the supporting portion 35 of the circumference seen wall 34 (wall opening Part) 47 is formed. The opening 47 is connected to the space of the recess 41. Therefore, the lubricating oil dropped from the mission case 12 can be sent from the outside in the radial direction of the support member 31 into the surrounding wall 34 through the recess 41 and the opening 47.

That is, the lubricating oil dropped from the mission case 12 enters the pinion gear 27 from the radial outside of the support member 31 via the recess 41 and the opening 47, or the recess 41 and the opening from the radial outside of the support member 31. It can be fed to the outer circumference of the pinion shaft 28 via the portion 47 and the washer 70.

Further, in the present embodiment, both side portions 50 (50a, 50b) of the circumference seen wall 34 is opening 47 is formed, the present invention is not limited thereto. In the present invention, for example, the opening 47 is formed in one of both side surface portions 50 (50a, 50b) of the surrounding wall 34 (preferably, the side surface portion 50 in the forward rotation direction of the differential case 14 of the surrounding wall 34). It may just be done.
Further, in the present embodiment, openings 47 are formed in the side surface portions 50 of all the surrounding walls 34, but the present invention is not limited to this. In the present invention, for example, the opening 47, in any one of circumference seen wall 34, or may only have been formed in a plurality of surrounding walls 34 not all of the surrounding wall 34. In this case, the recesses 41 formed between the two adjacent support portions 35 at both ends may be configured so that the recesses 41 are formed by the number of the surrounding walls 34 in which the openings 47 are formed.

Next, the operation of this embodiment will be described. In the differential device 11 of the present embodiment, when a rotational force is applied to the differential case 14 from the engine via the reduction gear mechanism 16, the plurality of pinion gears 27 do not rotate around the rotation axis RL, and the differential case 14 is combined with the differential case 14. It revolves around the central axis (rotation axis) CL. At this time, the left and right side gears 25 and 26 are rotationally driven from the differential case 14 via the plurality of pinion gears 27 at the same speed, and the driving force of the side gears 25 and 26 is evenly transmitted to the left and right output shafts 13a and 13b. Further, when there is a difference in rotational speed between the left and right output shafts 13a and 13b due to turning of an automobile or the like, the plurality of pinion gears 27 revolve around the central axis (rotational axis) CL of the differential case 14 while rotating, so that the pinion gears Rotational driving force is transmitted from 27 to the left and right side gears 25 and 26 while allowing differential rotation. The above is the same as the operation of the conventionally known differential device.

By the way, the lubrication to the outer periphery of the pinion gear 27 and the pinion shaft 28 in the differential device 11 of the present embodiment is performed as follows, for example.

A part of the lubricating oil dropped from the mission case 12 is guided from the radial outside of the support member 31 of the differential device 11 to the cavity 46 through the recess 41. Further, the lubricating oil guided to the cavity 46 passes through the shaft hole 48 of the surrounding wall 34 (more specifically, the inner end support portion 35a of both end support portions 35) located below the cavity 46 in the direction of gravity. It is guided to the inside of the surrounding wall 34. Then, the lubricating oil guided to the inside of the surrounding wall 34 through the shaft hole 48 is the outer circumference of the pinion shaft 28 (the sliding surface of the pinion shaft 28 with the pinion gear 27) inserted in the shaft hole 48, or The gear teeth 27a of the pinion gear 27 are lubricated along the end surface of the pinion gear 27 (more specifically, the inner end surface of the pinion gear 27 in the axial direction). When the differential case 14 is rotating, that is, when the support member 31 is rotating, the surrounding wall 34 from which the lubricating oil is guided from the cavity 46 changes each time.

Further, the other part of the lubricating oil dropped from the mission case 12 is directly sent to the pinion gear 27 from the radial outside of the support member 31 of the differential device 11 via the recess 41 and the opening 47, or further. It is guided to the outer circumference of the pinion shaft 28 via a washer 70. Further, a part of the lubricating oil directly guided to the pinion gear 27 directly lubricates the gear teeth 27a. Further, the other part of the lubricating oil directly guided to the pinion gear 27 further travels along the end surface of the pinion gear 27 (more specifically, the inner end surface or the outer end surface in the axial direction of the pinion gear 27) to the outer periphery of the pinion shaft 28. Lubricate the outer periphery of the pinion shaft 28 (the sliding surface of the pinion shaft 28 with the pinion gear 27). Further, the lubricating oil guided to the outer periphery of the pinion shaft 28 through the recess 41, the opening 47 and the washer 70 lubricates the outer periphery of the pinion shaft 28 (the sliding surface of the pinion shaft 28 with the pinion gear 27).

Further, the other part of the lubricating oil dropped from the mission case 12 is guided into the differential device 11 from the shaft hole 42 of each outer end side support portion 35b of the support member 31 of the differential device 11. Further, the lubricating oil guided from the shaft hole 42 into the differential device 11 is the outer periphery of the pinion shaft 28 (sliding surface of the pinion shaft 28 with the pinion gear 27) or the pinion shaft inserted in the shaft hole 42. The outer circumference of 28 and the end surface of the pinion gear 27 (more specifically, the outer end surface of the pinion gear 27 in the axial direction) or the washer 70 are used to lubricate the gear teeth 27a of the pinion gear 27.

According to the present embodiment, the differential device 11 forms a cavity 46 in which the lubricating oil dropped from the mission case 12 is formed from the radial outer side of the support member 31 toward the central axis CL, that is, in the central portion of the support member 31. The lubricating oil guided to the cavity 46 can be guided toward the pinion shaft 28, and the lubricating oil guided to the cavity 46 is slid with the pinion gear 27 of the pinion shaft 28 via the shaft holes 48 of the support portions 35 at both ends of the support member 31. It can be sent to the moving surface) and the pinion gear 27. As a result, the differential device 11 can lubricate the outer circumference of the pinion shaft 28 and the pinion gear 27 with the lubricating oil dropped from the transmission case 12. Therefore, the lubrication performance of the pinion gear 27 can be improved. As a result, the seizure resistance performance of the pinion gear 27 can be improved.

Further, according to this embodiment, in the differential apparatus 11, the side surface portions 50 of at least one of the enclosed seen wall 34 has an opening 47 penetrating the outer and inner surrounding walls 34 are formed. Therefore, the lubricating oil guided to the opening 47 is introduced from the opening 47 to the outer periphery of the pinion shaft 28 via the pinion gear 27 or the washer 70. As a result, the lubricating oil dropped from the mission case 12 can lubricate the outer periphery of the pinion gear 27 or the pinion shaft 28 without sending it to the central axis CL side of the support member 31. Therefore, the lubrication performance of the pinion gear 27 can be improved. As a result, the seizure resistance performance of the pinion gear 27 can be improved.

Further, according to the present embodiment, the recessed portion 45 is formed on a part of the outer peripheral surface of the support member 31 of the connecting plate 43 in the radial direction. As a result, the lightening of the support member 31 is realized, and the weight of the support member 31 can be reduced. As a result, the weight of the differential device 11 as a whole can be reduced.

Further, according to the present embodiment, the differential device 11 has a transmission in which the shaft hole 42 of each outer end side support portion 35b of the support member 31 is opened on the outer peripheral surface of the outer end side support portion 35b. Lubricating oil dropped from the case 12 can be sent to the outer circumference of the pinion shaft 28 (the sliding surface of the pinion shaft 28 with the pinion gear 27) and the pinion gear 27 via the shaft holes 42 of the support portions 35 at both ends of the support member 31. .. As a result, the differential device 11 can lubricate the outer circumference of the pinion shaft 28 and the pinion gear 27 with the lubricating oil dropped from the transmission case 12. Therefore, the lubrication performance of the pinion gear 27 can be improved. As a result, the seizure resistance performance of the pinion gear 27 can be improved.

In the first embodiment, as a modification, by connecting the inner end side support portions 35a of the both end support portions 35 of the two adjacent surrounding wall 34s, only the surrounding wall 34 without the connecting plate 43 is supported. The member 31 can also be configured. In this case, in the connecting portion of the two adjacent inner end side support portions 35a, a part of the support member 31 of at least one inner end side support portion 35a in the axial direction, that is, the circumferential direction of the inner end side support portion 35a. A notch is provided in a part of the support member 31 in the axial direction at least one of the one end 35aa and the other end 35ab in the circumferential direction. As a result, the recess 41 formed between the two adjacent surrounding walls 34 can penetrate the support member 31 in the radial direction and the radial direction. Therefore, the effect of the first embodiment can be obtained even in the modified example of the first embodiment.

Next, the second embodiment of the present invention will be described with reference to FIG. The configuration of the support member is mainly different from that of the first embodiment in the second embodiment. Therefore, in the second embodiment, a configuration different from that of the first embodiment will be described, and the same reference numerals will be given to the same configurations as those of the first embodiment, and detailed description thereof will be omitted.

FIG. 4 schematically shows the configuration of the support member 51 according to the second embodiment of the present invention. The support member 51 of the second embodiment is adjacent to, for example, a plurality of surrounding walls (wall portions) 134 having both end support portions 135 that individually support both end portions (one end portion and the other end portion) of the pinion shaft 28. It has a connecting plate (connecting portion) 53 that connects two matching surrounding walls 134. Further, the connecting plate (connecting portion) 53 of the second embodiment is different from the connecting plate (connecting portion) 43 of the first embodiment in the radial inward side of the support member 51 (that is, inside the support portions 135 at both ends). It is formed only on the end support portion 135a side). In other words, the space between the two adjacent surrounding walls 134 (that is, the two adjacent both end support portions 135) is formed on the radial inward side of the support member 51 (the inner end support portion 135a side of both end support portions 135). It is connected by the connecting plate 53 to be connected.

Further, on the radial outer side of the support member 51 between the two adjacent surrounding walls 134 (that is, the two adjacent both end support portions 135) (the outer end side support portion 35b side of the both end support portions 135), A concave space (recess) 52 formed like a recess is formed from the outer peripheral side to the inner peripheral side of the support member 51. The concave space 52 partitions a space between the first cover member 32 and the second cover member 33 that exposes the first side gear 25 and the second side gear 26.

Further, the support member 51 of the second embodiment is, for example, the outer peripheral wall of the surrounding wall 134 (the outer end side support portion 35b of both end support portions 135) connected (connected) to the first cover member 32 and the second cover member 33. ), That is, the connecting plate 53, the inner end side support portion 135a of both end support portions 135, and the side surface portion 150 of the surrounding wall 134 have a thickness in the axial direction of the support member 51 as compared with the outer peripheral wall of the surrounding wall 134. It is thinly formed. Therefore, the connecting plate 53, the inner end side support portion (one support portion, the other support portion) 135a of the both end support portions 135, and the side wall portion 150 of the surrounding wall 134 are the first cover member 32 and the second cover member 33, respectively. A space (second space) is formed between and.

Here, a space (first) formed between the connecting plate 53, the inner end side support portion 135a of the both end support portions 135, the side wall portion 150 of the surrounding wall 134, and each of the first cover member 32 and the second cover member 33. In the space (2), the space extending in the radial direction of the support member 51 (that is, the radial direction of the side gears 25 and 26) is the radial space, and the circumferential direction of the support member 51 (that is, the circumferential direction of the side gears 25 and 26). The space extending toward is sometimes called the circumferential space.

Therefore, lubrication to the outer periphery of the pinion gear 27 and the pinion shaft 28 in the differential device 110 of the second embodiment is performed as follows, for example.

A part of the lubricating oil dropped from the mission case 12 is a concave space 52 and a space between the connecting plate 53 and the first cover member 32 from the radial outside of the support member 51 of the differential device 110 ( More specifically, to the cavity (first space, space) 46 via the space (more specifically, the radial space) or the space (more specifically, the radial space) between the connecting plate 53 and the second cover member 33. Be guided. Further, the lubricating oil guided to the cavity 46 passes through the shaft hole 48 of the surrounding wall 134 (more specifically, the inner end support portion 135a of both end support portions 135) located below the cavity 46 in the direction of gravity. It is guided to the inside of the surrounding wall 134.

Then, the lubricating oil guided to the inside of the surrounding wall 134 through the shaft hole 48 is transferred to the outer circumference of the pinion shaft 28 (sliding surface of the pinion shaft 28 with the pinion gear 27) or the pinion shaft 28 inserted in the shaft hole 48. The gear teeth 27a of the pinion gear 27 are lubricated along the end surface of the pinion gear 27 (more specifically, the inner end surface of the pinion gear 27 in the axial direction). When the differential case 140 is rotating, that is, when the support member 51 is rotating, the surrounding wall 134 from which the lubricating oil is guided from the cavity 46 changes each time.

Further, the other part of the lubricating oil dropped from the mission case 12 is the concave space 52, the side wall portion 150 of the surrounding wall 134, and the first cover from the outside in the radial direction of the support member 51 of the differential device 110. Through the space between the member 32 (more specifically, the circumferential space) or the space between the side wall portion 150 of the surrounding wall 134 and the second cover member 33 (more specifically, the circumferential space). Is directly guided to the pinion gear 27.

Further, a part of the lubricating oil directly guided to the pinion gear 27 directly lubricates the gear teeth 27a. Further, the other part of the lubricating oil directly guided to the pinion gear 27 further travels along the end surface of the pinion gear 27 (more specifically, the inner end surface or the outer end surface in the axial direction of the pinion gear 27) to the outer periphery of the pinion shaft 28. Lubricate the outer periphery of the pinion shaft 28 (the sliding surface of the pinion shaft 28 with the pinion gear 27).

Therefore, according to the second embodiment, the differential device 110 can guide the lubricating oil dropped from the mission case 12 from the radial outside of the support member 51 toward the cavity 46 through the concave space 52. At the same time, the lubricating oil guided to the cavity 46 is sent to the outer periphery of the pinion shaft 28 (the sliding surface of the pinion shaft 28 with the pinion gear 27) and the pinion gear 27 via the shaft holes 48 of the support portions 135 at both ends of the support member 51. be able to. This will
Similar to the first embodiment, the outer circumference of the pinion gear 27 or the pinion shaft 28 can be lubricated. Therefore, the lubrication performance of the pinion gear 27 can be improved. As a result, the seizure resistance performance of the pinion gear 27 can be improved.

Further, according to the second embodiment, the connecting plate 53 is formed only on the radial inward side of the support member 51 (that is, the inner end support portion 135a side of both end support portions 135). without lowering the rigidity required for the surrounding wall 1 34, it is possible to reduce the weight of the support member 51. As a result, the weight of the differential device 110 as a whole can be reduced.

Further, according to the second embodiment, the concave space 52 is a space in which the first side gear 25 and the second side gear 26 are exposed between the first cover member 32 and the second cover member 33. Further, the side surface portion 150 of the surrounding wall 134 is formed to be thinner in the axial direction of the support member 51 than the outer peripheral wall of the surrounding wall 134 (more specifically, the outer end side support portion 35b of the both end support portions 135). ing. Therefore, the lubricating oil dropped from the mission case 12 can be introduced to the outer periphery of the pinion shaft 28 via the pinion gear 27 or the washer 70 via the concave space 52.

Therefore, also in the second embodiment, as in the first embodiment, the lubricating oil dropped from the mission case 12 is not sent to the central axis CL side of the support member 51, but is pinioned via the pinion gear 27 or the washer 70. It can be sent to the outer circumference of the shaft 28. As a result, the outer circumference of the pinion gear 27 or the pinion shaft 28 can be lubricated. Therefore, also in the second embodiment, the lubrication performance of the pinion gear 27 can be improved. As a result, the seizure resistance of the pinion gear 27 can be improved also in the second embodiment.

Further, according to the second embodiment, as in the first embodiment, the shaft hole 42 of each outer end side support portion 35b of the support member 51 is opened on the outer peripheral surface of the outer end side support portion 35b. , The lubricating oil dropped from the mission case 12 is sent to the outer circumference of the pinion shaft 28 (the sliding surface of the pinion shaft 28 with the pinion gear 27) and the pinion gear 27 via the shaft holes 42 of the support portions 35 at both ends of the support member 51. Can be done. As a result, the differential device 11 can lubricate the outer circumference of the pinion shaft 28 and the pinion gear 27 with the lubricating oil dropped from the transmission case 12. Therefore, the lubrication performance of the pinion gear 27 can be improved. As a result, the seizure resistance performance of the pinion gear 27 can be improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist thereof.

Further, in the first embodiment and the second embodiment, the differential devices 11 and 110 and the reduction gear mechanism 16 are configured as separate bodies, but the present invention is not limited to this. In the present invention, for example, either one of the first cover member 32 and the second cover member 33 of the differential devices 11 and 110 may be integrally configured with the carrier of the reduction gear mechanism 16. As a result, the thickness in the central axis CL direction when the differential devices 11 and 110 and the reduction gear mechanism 16 are connected can be reduced. As a result, it is possible to contribute to narrowing the width of the differential devices 11, 110 and the reduction gear mechanism 16. Further, the weight of the differential devices 11 and 110 and the reduction gear mechanism 16 as a whole can be reduced.

Further, in the first embodiment and the second embodiment, the cavity 46 is provided in the central portion of the support members 31 and 51, but the present invention is not limited to this. In the present invention, for example, the support members 31 and 51 may not have the cavity 46 provided in the central portion. In this case, the effect obtained by using the cavity 46 in the present invention cannot be obtained, but the effect obtained without using the cavity 46 in the present invention can be obtained.

11 ... Differential device, 14 ... Diff case (input member), 25 ... 1st side gear (side gear, 1st output gear, output gear), 26 ... 2nd side gear (side gear, 2nd output gear, output gear), 27 ... Pinion gear (differential gear), 28 ... pinion shaft (shaft, differential gear support member), 31 ... support member, 32 ... first cover member, 33 ... second cover member, 34 ... surrounding wall (wall part), 35 ... Both ends support portion, 35a ... Inner end side support portion (one support portion, other support portion), 35b ... Outer end side support portion (other support portion, one support portion), 41 ... Recessed portion (concave hole) , 45 ... recessed portion, 46 ... cavity (space, first space), 47 ... opening (wall opening), 48 ... shaft hole (through hole), 51 ... support member, 52 ... concave space (recessed space), 53 ... Connecting plate (connecting part), 134 ... Surrounding wall (wall part), 135 ... Both ends support part, 135a ... Inner end side support part (one support part, other support part), 150 ... Side part.

Claims (6)

With multiple differential gears (27),
A plurality of differential gear support members (28) that support each of the plurality of differential gears (27),
A pair of output gears (25, 26) that mesh with the plurality of differential gears (27), respectively.
Each of the differential gear support members (28) has a plurality of both end support portions (35) for supporting both end portions, and a space (46) is formed in the central portion radially inward from the end end support portions (35). Support member (31) to be
A first cover member (32) arranged on the back side of one of the output gears (25) and capable of being coupled to the support member (31).
A second cover member (33) arranged on the back side of the other output gear (26) and capable of being coupled to the support member (31).
With
Between the two adjacent both end support portions (35) of the support member (31), the support member (31) penetrates from the outer side in the radial direction to the inner side in the radial direction to the space (46) . A recess (41) is formed,
Wherein each of the plurality of both end support portions (35), before SL has differential end-side supporting portion in supporting the inner end of the gear support member (28) and (35a),
In said end-side support portion (35a) has a through hole penetrating the inner end-side support portion (35a) (48) is formed,
Differential device. The support member (31) has a plurality of wall portions (34) each including both end support portions (35).
At least one wall portion (34) is formed with an opening (47) penetrating the outside and the inside of the wall portion (34).
The differential device according to claim 1. The support member (31) has a recess (45) formed in a surface forming one side surface or a bottom surface of the recess (41) from the outer side in the radial direction to the inner side in the radial direction of the support member (31). The differential device according to claim 1 or 2. With multiple differential gears (27),
A plurality of differential gear support members (28) that support each of the plurality of differential gears (27),
A pair of output gears (25, 26) that mesh with the plurality of differential gears (27), respectively.
A plurality of both end support portions (135) that support both end portions of each of the differential gear support members (28), and a plurality of connection portions (53) that connect two adjacent both end support portions (135). And a support member (51) in which a space (46) is formed in the central portion.
A first cover member (32) arranged on the back side of one of the output gears (25) and capable of being coupled to the support member (51).
A second cover member (33) arranged on the back side of the other output gear (26) and capable of being coupled to the support member (51).
With
Between the two adjacent both end support portions (135) of the support member (51), the connecting portion (53) is provided on the radial inward side of the support member (51), and the support member (51) is provided. A recess (52) is formed on the outer side in the radial direction of the above.
In the connecting portion (53), a radial space extending in the radial direction of the support member (51) is formed between each of the first cover member (32) and the second cover member (33). And
Wherein each of the plurality of both end support portions (1 35) has at least the differential gear support member one of the support portion for one supporting an end portion (28) and (135a),
A through hole (48) penetrating the one support portion (135a) is formed in the one support portion (135a).
Differential device. With multiple differential gears (27),
A plurality of differential gear support members (28) that support each of the plurality of differential gears (27),
A pair of output gears (25, 26) that mesh with the plurality of differential gears (27), respectively.
A support member (31) having a plurality of wall portions (34) having both end support portions (35) for supporting both end portions of each of the differential gear support members (28).
A first cover member (32) arranged on the back side of one of the output gears (25) and capable of being coupled to the support member (31).
A second cover member (33) arranged on the back side of the other output gear (26) and capable of being coupled to the support member (31).
With
Each of the two adjacent wall portions (34) is connected by a plurality of connecting portions (43) or directly.
A recess (41) recessed from the radial outer side to the radial inward side of the support member (31) is formed between the two adjacent wall portions (34).
The both end support portions (35) of each of the wall portions (34) are an inner end side support portion (35a) that supports the inner end portion of the differential gear support member (28) and the differential gear support portion (35a). It is provided with an outer end side support portion (35b) that supports the outer end side of the member (28).
The at least one wall portion (34) has the recess (41), the inner end side support portion (35a), and the outer end side support portion on the outer side in the radial direction from the inner end side support portion (35a). An opening (47) penetrating the space between (35b) is formed .
The inner end side support portion (35a) projects from the outer diameter of the radial inner end of the differential gear (27) to the radial outer diameter of the differential gear (27) .
Differential device. With multiple differential gears (27),
A plurality of differential gear support members (28) that support each of the plurality of differential gears (27),
A pair of output gears (25, 26) that mesh with the plurality of differential gears (27), respectively.
A plurality of wall portions (134) having both end support portions (135) for supporting both end portions of each of the differential gear support members (28) and side wall portions (150) for connecting both end support portions (135). ), And a support member (51) having a plurality of connecting portions (53) connecting the two adjacent wall portions (134).
A first cover member (32) arranged on the back surface side of the output gear (25) and capable of being coupled to the support member (51).
A second cover member (33) arranged on the back side of the other output gear (26) and capable of being coupled to the support member (51).
With
Between the two adjacent wall portions (134) of the support member (51), the connecting portion (53) is provided on the radial inward side of the support member (51) of the support member (51). A recess (52) is formed on the outer side in the radial direction.
In the side wall portion (150), a circumferential space extending in the circumferential direction of the support member (51) is formed between each of the first cover member (32) and the second cover member (33). ing,
Differential device.